Feature Request: Allow for custom entity_id

[emarj]

The issue

One major gripe I have with using KNX integration is the fact that I have no way to specify entity_id directly.

Of course for the time being there is are 2 workarounds:

1. change the entity_id from the UI
2. set the name to the wanted entity_id and then change the name from the UI

The second one is, for me, the best, since with the first the original entity_id will persist in the history.

The proposed solution

Would be really nice to have an id field in every YAML entity that allows to set the entity_id. This would make managing big projects easier and more streamlined, at least in my opinion.

What do you think?

Just glimpsing at the code I suspect that this change would be easy but tedious since will require a modification of almost every file.
I could work on this PR in case.

Thanks

[farmio]

Hi 👋!
I'm not sure if this would be allowed in a core integration, but seeing that template added default_entity_id recently, it might.
That said, it would always be kind of wired since a user can edit it in UI and it couldn't be reflected in yaml - same as we currently have with name, which is also confusing for some users.

[farmio]

See home-assistant/core#151235